On 09/17/2016 09:23 AM, Eric Smith wrote: > I don't know what the width of the TMS9900 ALU is, but I'm pretty > sure it's not bit-serial, as an add instruction only takes 14 clock > cycles, including four memory cycles. I'd be very surprised if the > ALU isn't either 8 or 16 bits, though 4 might be possible. > > Possibly someone is confused by the bit-serial "CRU' I/O space, but > that is unrelated to the ALU width.
Could very well be--I'm just going by other's appraisals of the architecture. But there were some "8 bit" MPUs with bit-serial ALUs, so the question is still valid. --Chuck
